Sprocket-wheel for drive-chains.



PATNEBD'Mmao, 1905,. i

' am. 4751.329. n "L M. DODGE.

SPROGKBT WHEEL Po y TIoN I E n m l 1 phia, Pennsylvania, have inventedcertainIm-- proveniente in Sprocket-Wheels for Drive-v i' UNITED STATESPatented May 30, 1905.

PATENT' OFFICE;

JAMES M. DODGE, OFIPHILADELPHIA, PENNSYLVANIA, AssreNoE To THE LINK BELTENGINEERING COMPANY, OF PHILADELPHIA;J PENN- SYLVANIA, A CORPORATION OFPENNSYLVANIA.

SPROC-KET'WWHEEL FOR DF'lIVE-CHAINS.v

SPECIFICATION forming part of Letters Patent No. 791,329, dated may 3o,1905.

Application filed February 6, 1963. Serial No. 142.212..

Todall whom it #my concern: v

Be it'known that I, J AMES M. DODGE, a citizen ofV the United States,residing in Philadel-l Chains, ofwhich the followingA is a speciticaftion.

fss

lThe object of my invention is to provide an equalizingl device betweena, source of power andthe driven element, so that if the .powergeneratoris of sucha type that there is a pulsation or unevenness lin therotation of the power element 4the equalizing device will aby Sorb theshock dueto this uneven rotation and transmit the power more evenly, andif the device to which power is applied operates unc, evenlythen theequalizing device will absorb this shock and prevent it being. carriedto the driving mechanism.

My invention is especiallyapphcable to the A sprocketwheels used inconnection with what 1s known as a silent drive-chain-that is,

a drive-chain having teeth which engage theteeth of a sprocket-wheel,the chain beingvso constructedA as to take up the wear automatically. 4j' Referring to the accompanying drawings, Figurel is a side view of myimproved sprocket-wheel, Fig. 2 is a'seetional view on the line 2 2', 1.i

In the present instance,'A is` the powerf shaft, which may be thecrank-shaft of a reciprocating engine or may be geared thereto or to anyv,power-shaft.

- B is the sprocket-wheel, madC- Vln two parts C and D. Thepart O'is thehliielement and the part D is the rim element, having sprocket,-`

teeth d. These teeth may be of any shape de- I tudinal `line throughthe-springs is at .right` angles to the bearing-faces. 'n

On the hub-section are arms e e', alternating with the arms c@,and'carried b`y these arms c areset-screwse", whichbear against theback of the internal projectionsd of the rimsection', thebearing-surface for the set-screws being at r1ght angles to thelongitudinal line of the screws.

, The set-screws are used for adjusting the'. initial tension of thesprings EE, and' byl turning 'the set-screws the springs can `'be set toany initial tension desired. These set-screws arey not absolutely,necessary, but are prefer'- ably used.

The hub-section has one side plate, tfforrned` integral withit, whilethe other side plate, e",

is detachable therefromvv and 4is held in placev by screwbolt's"ci^' Therim-section D has a central annular rib d3, which rests vbetween the twoside plates c3, as indicated in `cross-section, so that it will be heldrigidly-in line at all points, and

while it is free to have alimited rotary motion it is confined laterallyto the hub.

It will be seen that the springs and their bearingsfare located inadirect line with theygear-teeth', and therefore the power transmit# tedthrough the sprocket-wheel is in a direct A line.

lt will be noticed in referring to Fig. 1 tnhatf I referably make thearms c of the hb-sect on double-faced and each face having a lug c'. Bythis arrangement the rim-section cani be mounted on the Jaub-sectionwith the inl ternal projection ff either/side 'of the arm, and theset-screws can be reversed, so that the parts can be assembled accordingtothe direction of rotation of the powershaft.

While I have illustrated my'inventionin l connection with asprocket-wheel, it willbe wheel without departing from my invention,

and the shaft A may in some instances be the my improved sprocket oi`gear whoel'will take understood that it may be used with a gear-.-

up any unevenness in the drive, and especially when it is used as asprocket-wheel for drive-chains it will prevent the rapid wearing awayof vthe chain and the teeth of the wheel by absorbing the shock due tothe un` even rotation of the power-transmitter.

My invention is especially applicable where the power-shaft is thecrank-shaft of a reciprocating engine and where Va sprocket-wheel is.either mounted directly on the power-shaft or geared directly thereto.-The unevenness' of rotation of the driving-shaft is very ap- 4 parent,and Where a non-'yielding` sprocket is an internal projection on therim-section extending into -the space between thetwo arms, a springmounted between the projection and one of seid arms, and a set-screwcarried by.-

thev other arm and arranged to bear against the said projection,substantially as described;

j 2'. The combination of a hub-section, a rimsection mountedon thehub-section and having teeth thereon, two bearing-arms on thehub-section, with two internal projections on the rim-section, springs,one spring mounted between one projection and one arm, and the othermounted between the other projection and the other arm, with twosct-screw-carrying arms on the hub-section, a set-screw in each arm,each set-screw arranged to contact with a projection on the rim-section,substantially as described.

3. The combination of a hub-section arranged to be secured to a shaft, arim-section having teeth on its periphery, said hub-section having twoarms diainetrically opposite each other, two internal projections on therim section opposite each other, springs mounted between the projectionsand the arms, arms on the hub alternating with thebearingarms,'setscrews on the said arms arranged to bear against theprojections on the rim-scction, a side plate integral with the hub, and

va side plate detachable therefrom, said side plates supporting therim-section, with screwbolts extending through the detachable sideplateand into threaded openings in the arms, substantially as described.

In testimony whereof l have signed my name to this specification in thepresence of two suby scribng witnesses.

' JAMES M. DODGE.

Witnesses:

WILL. A. BARR, Jos. H. KLEIN.

